:root{
  --bg:#f8f7f4;
  --panel:#ffffff;
  --ink:#111827;
  --muted:#6b7280;
  --line:#e6e1d8;
  --soft:#ede8df;
  --accent:#9a7856;
  --accent-dark:#5f432e;
  --shadow:0 24px 70px rgba(17,24,39,.08);
  --radius:28px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:radial-gradient(circle at top right,rgba(154,120,86,.12),transparent 32%),var(--bg);color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",Arial,sans-serif;line-height:1.72;text-rendering:optimizeLegibility}
a{color:inherit;text-decoration:none}
img,video{max-width:100%;display:block}
.container{width:min(1180px,calc(100% - 40px));margin-inline:auto}
.skip-link{position:absolute;left:-999px;top:12px;background:var(--ink);color:#fff;padding:10px 14px;border-radius:12px;z-index:20}.skip-link:focus{left:12px}
.site-header{position:sticky;top:0;z-index:10;background:rgba(248,247,244,.82);backdrop-filter:blur(18px);border-bottom:1px solid rgba(230,225,216,.78)}
.navbar{display:flex;align-items:center;justify-content:space-between;gap:24px;padding:18px 0}
.logo{display:flex;align-items:center;gap:12px;font-weight:800;letter-spacing:-.03em}.logo img{width:44px;height:44px}.logo span{font-size:20px}
.nav-links{display:flex;gap:6px;align-items:center;flex-wrap:wrap}.nav-links a{padding:10px 13px;border-radius:999px;color:#3f4654;font-size:14px}.nav-links a:hover,.nav-links a:focus{background:#fff;box-shadow:0 10px 30px rgba(17,24,39,.06);outline:none;color:var(--ink)}
.header-actions{display:flex;align-items:center;gap:10px}.pill{display:inline-flex;align-items:center;justify-content:center;border:1px solid var(--line);background:#fff;border-radius:999px;padding:10px 16px;font-weight:700;font-size:14px}.pill.primary{background:var(--ink);color:#fff;border-color:var(--ink)}
.search-band{border-top:1px solid rgba(230,225,216,.7);padding:14px 0 18px}.search-form{display:flex;gap:10px;background:#fff;border:1px solid var(--line);box-shadow:0 12px 40px rgba(17,24,39,.04);padding:8px;border-radius:999px}.search-form label{position:absolute;left:-999px}.search-form input{flex:1;border:0;background:transparent;padding:12px 16px;font-size:15px;outline:none}.search-form button{border:0;border-radius:999px;background:var(--accent-dark);color:#fff;padding:12px 20px;font-weight:700;cursor:pointer}.search-note{min-height:22px;margin:8px 0 0;color:var(--muted);font-size:13px;padding-left:12px}
.hero{padding:84px 0 54px}.hero-grid{display:grid;grid-template-columns:1.12fr .88fr;gap:46px;align-items:center}.eyebrow{display:inline-flex;gap:8px;align-items:center;border:1px solid var(--line);background:rgba(255,255,255,.7);border-radius:999px;padding:8px 12px;color:var(--accent-dark);font-weight:800;font-size:13px}.hero h1{font-size:clamp(42px,7vw,84px);line-height:1.02;letter-spacing:-.075em;margin:24px 0 20px}.lead{font-size:clamp(18px,2.2vw,23px);color:#4b5563;max-width:760px}.domain-card{display:flex;gap:12px;align-items:center;background:#fff;border:1px solid var(--line);border-radius:22px;padding:14px 16px;margin:26px 0;box-shadow:var(--shadow)}.domain-card strong{font-size:15px}.domain-card code{font-size:15px;color:var(--accent-dark);white-space:normal;word-break:break-word}.hero-actions{display:flex;gap:12px;flex-wrap:wrap}.hero-visual{position:relative}.hero-visual .video-card{transform:rotate(1.2deg)}
.section{padding:54px 0}.section-head{display:flex;justify-content:space-between;gap:20px;align-items:end;margin-bottom:24px}.section-title{font-size:clamp(28px,4vw,48px);letter-spacing:-.055em;line-height:1.08;margin:0}.section-desc{color:var(--muted);max-width:640px;margin:8px 0 0}.intro-panel{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:42px;box-shadow:var(--shadow);display:grid;grid-template-columns:1fr 1fr;gap:32px}.intro-panel h2{margin:0;font-size:36px;line-height:1.18;letter-spacing:-.04em}.intro-panel p{margin:0;color:#4b5563}.mini-list{display:grid;gap:14px}.mini-item{border-left:3px solid var(--accent);padding-left:16px}.mini-item strong{display:block}.mini-item span{color:var(--muted);font-size:14px}
.video-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}.video-card{background:#fff;border:1px solid var(--line);border-radius:28px;overflow:hidden;box-shadow:0 16px 50px rgba(17,24,39,.06);transition:transform .25s ease, box-shadow .25s ease}.video-card:hover{transform:translateY(-6px);box-shadow:0 28px 76px rgba(17,24,39,.11)}.video-media{position:relative;aspect-ratio:16/10;background:var(--soft);overflow:hidden}.video-media video{width:100%;height:100%;object-fit:cover}.video-media img{width:100%;height:100%;object-fit:cover}.play{position:absolute;inset:0;display:grid;place-items:center;background:linear-gradient(to top,rgba(17,24,39,.32),transparent 55%);opacity:0;transition:opacity .22s ease}.video-card:hover .play,.video-card:focus-within .play{opacity:1}.play span{width:68px;height:68px;border-radius:50%;background:rgba(255,255,255,.92);display:grid;place-items:center;box-shadow:0 20px 45px rgba(0,0,0,.16)}.play span::before{content:"";border-top:13px solid transparent;border-bottom:13px solid transparent;border-left:20px solid var(--ink);margin-left:4px}.duration{position:absolute;right:14px;bottom:14px;background:rgba(17,24,39,.86);color:#fff;border-radius:999px;padding:4px 10px;font-size:12px}.video-body{padding:20px}.video-body h3{font-size:19px;line-height:1.35;letter-spacing:-.025em;margin:0 0 10px}.video-body p{font-size:14px;color:#5b6472;margin:0}.tag-row{display:flex;gap:8px;flex-wrap:wrap;margin:14px 0}.tag{font-size:12px;background:#f4f0ea;color:#70523a;border-radius:999px;padding:5px 9px}.metrics{display:flex;gap:12px;flex-wrap:wrap;color:#6b7280;font-size:13px;border-top:1px solid var(--line);padding-top:14px;margin-top:14px}.image-desc{font-size:12px;color:#7c8491;margin-top:10px}
.board-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}.board-card{background:rgba(255,255,255,.82);border:1px solid var(--line);border-radius:26px;padding:24px;transition:transform .22s ease, background .22s ease}.board-card:hover{transform:translateY(-4px);background:#fff}.board-card h3{margin:0 0 8px;font-size:21px;letter-spacing:-.03em}.board-card p{margin:0;color:var(--muted);font-size:14px}.board-count{margin-top:22px;font-weight:800;color:var(--accent-dark)}
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}.stat{background:#111827;color:#fff;border-radius:26px;padding:28px}.stat strong{display:block;font-size:34px;letter-spacing:-.04em}.stat span{color:#d1d5db;font-size:14px}
.review-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}.review-card{background:#fff;border:1px solid var(--line);border-radius:26px;padding:24px}.review-card p{color:#4b5563;margin:0 0 18px}.review-card strong{display:block}.review-card span{color:var(--muted);font-size:13px}
.faq-list{display:grid;gap:12px}.faq-item{background:#fff;border:1px solid var(--line);border-radius:22px;overflow:hidden}.faq-question{width:100%;display:flex;justify-content:space-between;gap:20px;align-items:center;border:0;background:transparent;padding:20px 22px;text-align:left;font-weight:800;font-size:16px;cursor:pointer;color:var(--ink)}.faq-question::after{content:"+";font-size:24px;color:var(--accent-dark)}.faq-item.open .faq-question::after{content:"−"}.faq-answer{display:none;padding:0 22px 22px;color:var(--muted)}.faq-item.open .faq-answer{display:block}
.join-panel{display:grid;grid-template-columns:.85fr 1.15fr;gap:28px;background:#fff;border:1px solid var(--line);border-radius:32px;padding:34px;box-shadow:var(--shadow)}.join-form{display:grid;gap:12px}.join-form label{font-weight:700;font-size:13px}.join-form input,.join-form textarea{width:100%;border:1px solid var(--line);border-radius:16px;background:#fbfaf8;padding:13px 14px;font:inherit}.join-form textarea{min-height:108px;resize:vertical}.join-form button{border:0;border-radius:18px;background:var(--ink);color:#fff;padding:14px 18px;font-weight:800;cursor:pointer}.form-msg{color:var(--muted);font-size:13px;min-height:22px}
.breadcrumb{color:var(--muted);font-size:14px;margin-top:22px}.page-hero{padding:54px 0 28px}.page-hero h1{font-size:clamp(36px,5vw,64px);line-height:1.08;letter-spacing:-.06em;margin:16px 0}.content-panel{background:#fff;border:1px solid var(--line);border-radius:28px;padding:34px;box-shadow:var(--shadow)}.content-panel h2,.content-panel h3{letter-spacing:-.04em}.content-panel p,.content-panel li{color:#4b5563}.simple-list{display:grid;gap:14px;margin:0;padding:0;list-style:none}.simple-list li{background:#fbfaf8;border:1px solid var(--line);border-radius:18px;padding:18px}
.site-footer{margin-top:60px;background:#111827;color:#f9fafb}.footer-grid{display:grid;grid-template-columns:1.1fr .9fr .9fr;gap:32px;padding:46px 0}.site-footer .logo span{color:#fff}.site-footer p,.site-footer a,.site-footer li{color:#d1d5db}.footer-links{display:grid;gap:8px;margin:0;padding:0;list-style:none}.copyright{border-top:1px solid rgba(255,255,255,.1);padding:18px 0;color:#d1d5db;font-size:14px}.toast{position:fixed;left:50%;bottom:24px;transform:translateX(-50%) translateY(20px);background:#111827;color:#fff;padding:12px 16px;border-radius:999px;box-shadow:var(--shadow);opacity:0;pointer-events:none;transition:opacity .2s ease, transform .2s ease;z-index:30}.toast.show{opacity:1;transform:translateX(-50%) translateY(0)}
@media (max-width: 960px){.hero-grid,.intro-panel,.join-panel,.footer-grid{grid-template-columns:1fr}.video-grid,.board-grid,.review-grid{grid-template-columns:repeat(2,1fr)}.stats{grid-template-columns:repeat(2,1fr)}.section-head{display:block}.navbar{align-items:flex-start}.nav-links{max-width:100%;overflow:auto;flex-wrap:nowrap;padding-bottom:4px}.header-actions{display:none}}
@media (max-width: 640px){.container{width:min(100% - 28px,1180px)}.hero{padding:48px 0 26px}.video-grid,.board-grid,.review-grid,.stats{grid-template-columns:1fr}.intro-panel,.join-panel,.content-panel{padding:24px;border-radius:22px}.search-form{border-radius:24px;align-items:stretch;flex-direction:column}.search-form button{width:100%}.footer-grid{gap:18px}.stat strong{font-size:28px}}
@media (prefers-reduced-motion: reduce){*{scroll-behavior:auto!important;transition:none!important;animation:none!important}}